Slush pump



April .24, 1951 Q. o. STEVEN-S SLUSH PUMP 2 Sheets-Sheet 1 Filed July 23, 1948 ON 9 N O- INVENTOR Quinn 0.81evens BY E g a ATTORNEYS.-

Ap 1951 v Q.. o. STEVENS 2,550,171

SLUSH PUMP Filed July 23, 1948 2 Sheets-Sheet 2 FIG.2.

INVENTOR.

Quinn 0. Stevens ATTORNEYS.

operations of the latter.

Patented Apr. 24, 1951 UNITED STATES PATENT OFFICE SLUSH PUMP Quinn 0. Stevens, Oklahoma City, Okla. Application July 23, 1948, Serial N 0. 40,261

3 Claims.

This invention relates to the crosshead extenoil well drilling.

An important object of the invention is to provide such a structure which will tend to prevent during washing out of the pump liner and piston piston in the liner and of the piston rod in its packing, whereby abrasive foreign matter lodged between these fixed and moving parts will not only be prevented from cutting grooves or become imbedded in the rubber of the piston, but it will become disintegrated so that it will be apt to pass readily from between moving and fixed surfaces without damaging them;

In present day piston pump structure, generally large jam nuts are employed at locations where one member screws into another so as to decrease the hazards of backing-off when the pumps are in operation.

It is another important object of the invention to further decrease these hazards by providing means which will tend to cause the screw threads of the members to make up rather than break out.

A still further important object is to provide a structure including a replaceable end, or bushing,

in the crosshead extension rod, so as to permit the end or bushing to be replaced instead of sub stituting a new rod.

Still another object of the invention is to provide a ratchet-operated means associated with the walls of a groove to efiect step-by-step ro tation of a reciprocating piston and its rod'during the conventional reciprocations of these elements. e

Other objects and advantages of the invention will be apparent during the course of the following detailed description of the invention, taken in connection with the accompanying drawings, forming a part of this disclosure, and in which drawings: v

Fig. 1 is a side elevation of a conventional power-driven slush pump with parts broken away inorder to show the novel crosshead extension rod structure associated therewith.

Fig. 2 is a longitudinal section of the new crosshead extension rod structure with portions of the conventional piston assembly associated therewith. r

Fig. 3 is a transverse section substantially upon the line 3-3 of Fig. 2.

structure.

Fig. 4 is an elevation of a trip housing with trip and bracket (partly broken away).

Fig. 5 is a longitudinal section of a grooved housing for association with a part of the mechanism of Figs. 3 and 4.

Fig. 6 is a view of a ratchet ring associated with the structure of Fig. 3.

In the drawings, wherein for the purpose of i1- lustration is shown a preferred embodiment of the invention and wherein similar reference characters designate corresponding parts thruout the several views, the letter A designates a slush pump and B the new crosshead extension rod The slush pump A is'a conventional motordriven one with horizontally disposed piston structure I0, including a crosshead ll having a screw threadedsocket l2 and a piston rod [3 having a screw threaded end portion [4. There is also shown a crosshead extension rod packing housing Hi, all carried by a pump housing I6.

The novel crosshead extension rod structureB includes a crosshead coupled portion 20 which is preferably cylindrical, having screw threads 2| at one end portion 22 for cooperation with the screw threads of the socket l2, and a substantially smooth, other end portion-23 ending in a flat end face 24. The end portion 23 is provided with a screw threaded socket 25 receiving the screw threaded end portion 26 of a shaft 21 which shaft, at-its other end portion 28, is enlarged in diameter and extends thru a swivel housing 29 which is open at one end portion 33 to provide a socket 3| receiving the end portion 23 (whereby the housing 29 may rotate relative to the nonrotating crosshead) and thrust bearing means, as the ball bearing assembly 32, with the outer face of the cage of the latter abutting'the flat end face 24 and the other outer face of the cage abutting the base of the socket 3|. The assembly 32 surrounds the shaft preferably just beyond the end portion 2'6 of the shaft.

The housing 29 is also open at its other end 33 providing a socket 34 which is screw threaded for a portion of its length and smooth-bored for the ren'iainder. The smooth-bored portion of the socket 34 receives the enlarged end portion 28 of the shaft, and a thrust bearing means, as the ball bearing assembly 35, with one outer face of Y threaded bushing 36 with the interior screw threads provided for detachably coupling of the screw threaded end portion l4 of the piston rod l3 thereto and to the housing 29.

Suitable jam nuts 31 and 38 may be provided. and mounted upon the portion 20 and piston rod I3 substantially as in Fig. 1.

Means to effect rotation of the housing 29 and, consequently, the structure fixedly secured to it, includes a 'ratchetmember, preferably a ratchet ring 40 secured about the exterior of the housing 29 as by the screws 4|, preferably as shown in Fig. 3. Associated With the teeth of the ratchet ring 40 is a spring-loaded reciprocating trip 42 reciprocable in a housing 43 carried by a ringshaped bracket 44 encircling but not secured to V the housing 20.

As may be seen in Fig. 2 the bracket -44 cannot slide longitudinally of the housing (although it canyslide around the housing 20) because on one side of the ring of the bracket 44 is the rat chet 1 ring 4llfixedly secured'jto the housing'20 and on the other side ,of, the ratchet; ring 40 is a shoulder 44' of the body portion 20.

The ends of the trip 42 project from the housing 43 in a ratchet teeth-engaging head 45 at one ,end and a guide tail structure 46 at its other end.

The guide tail structure 46 preferably includes a ball bearing assembly 41, which is constructed.- and arranged to roll along a groove 48, shown in Fig. 5. This groove comprises two straight portions with the longitudinal axes of the portions forming an obtuse angle and the axis of one portion extending longitudinally of the pump housing IS. The groove is in a bracket structure 49 mounted preferably at the inside of the pump housingat the rear of the crosshead extension rod packing housing 15.

As the piston assembly reciprocates, as is common in the art,rthe ball bearing assembly 4'! rolls along the groove 48 in one direction and the piston assembly .will be rotated (clockwise) one step. As the ball bearing assembly 47 rolls along the groove 48 in the other direction the contour of .the groove48 causes its side walls to reciprocate the spring-loaded trip 42 and thus make possible actuation of the assembly 4?, trip 42 andratchet ring 40 to effect another step rotation (clockwise) of the piston assembly.

Because of the swivelled connection provided by the structure disclosed, the jam nuts will not be apt to back ofi.

Various changes may be made to the form of the invention herein shown and described without departing from the spirit of the invention or scope of the claims.

What is claimed is:

1. In a crosshead extension rod structure for a slush pump which slush pump has a pump housing, a piston rod and a crosshead, means to permit rotation of said piston rod with respectto said crosshead, including a swivel housing fixedly secured to said piston rod and rotatably secured to said crosshead, and means to cause rotation of said swivel housing and piston rod upon reciprocation of said crosshead, swivel, housing and piston rod, including a bracket structure secured to said pump housing and provided with a groove, said groove including a first portion of said portions forming an obtuse angle and one of said portions extending longitudinally of said pump housing, a ratchet ring extending s and a second portion with the longitudinal axes 'Number about the periphery of said swivel housing and fixedly secured thereto, a spring-loaded trip having a ratchet tooth-engaging head and a tail structure, a trip housing for reciprocally mounting said trip with said tail structure extending into saidv groove. and engaging the side walls thereof, and a bracket for said trip housing slidably carried. by said. swivel housing.

2. In a. crosshead extension rod structure for a slush pump which slush pump has a pumphousing, a piston rod and a crosshead, means to permit rotation of said piston rod with respect to said. crosshead, including a swivel housing fixedly secured to said. piston rod rotatably secured to said crosshead, said swivel housing having a. peripheral shoulder, and means to cause rotation 'o'ffs'aid swivel housing and piston rodupon reciprocation of said crosshead, swivel hous ing and piston rod, including a bracket structuresecured to said pump. housing and provided with; a groove, said groove including a first portion and a second portionwith the longitudinal axes of said portions forming an obtuse angle and one of said portions, extending longitudinally of saidpump housing, a ratchet ring extending about the periphery of said swivel; housing and fixedly secured thereto, a spring-loaded trip having av ratchet tooth-engaging head, and a tail struc-- ture, a trip housing for reciprocally mounting said trip with said tail structure extending into: said; groove and engaging the side walls thereof,. and a bracket for said trip housing slidably carried by said swivel hous ng'and disposed between said shoulder and said ratchet ring.

3. In a crosshead extension rod structure for a slush pump which slush pump. has a pump housing, a piston rod and a crosshead, means to: permit rotation of said piston rod with respect to said crosshead, including a swivel housing: fixedly secured to said piston rod and rotatably' secured to said crosshead, said, swivel housing having a peripheral shoulder, andfmeans to cause rotation of said swivel housing and piston rod; upon reciprocation of said crosshead, swivel housing and piston rod, includingajbracket structuresecured to said pump housing and provided with. a groove, said groove including; a first, portion and. a second portion with the longitudinal axes of. said portions forming an obtuse angle and one of said portions; extending longitudinally of said. pump housing, aratchet; ring extending about the periphery of-said'swiye]; housing and fixedly secured thereto, a, spring-loaded "trip having a ratchet tootheengaging'head andja tail structure; including a friction-reducing assembly having: a rotating cage portion Within said groove, a trip: housing for reciprocally mounting said trip with--. thecage of said tail structure extending into said: groove and engaging the side walls thereof, and; a bracket for said trip housing slidablyc'arried; by said swivel housing and disposed between said. shoulder and said ratchet ring.

QUINN O. STEVENS.

file of this patent:

UNITED STATES PATENTS V Name Date 1 1,625,096 Routson Apr. 19, 1927 2,039,583 Dieterich May 5, 1936' 2,417,948.

Reimuller Mar. 25, 194.7, 

